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In order to recognize the positive and negative of contact, convex in contact case can makes it simply to differentiate the positive and negative side.
The user do not need to be confused for left or right, just use top and bottom to decide the order of priority.
1. Light touch the convex in the case.
2. It can put on immediately.
3. Open the under cover and pick up another one.
Chaoyang University of Technology
Taichung City, Taiwan
Jia -Jing,Liao,
Chaoyang University of Technology
Chia-Yu,Ho,
Chaoyang University of Technology
Szu-Hui,Wang,
Chaoyang University of Technology